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771 horse stock stroke 360 motor, pump gas #2554523
09/25/18 02:37 PM
09/25/18 02:37 PM
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Portage,michigan
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B3422W5 Offline OP
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Local engine builder is taking this motor to Charlotte on 4th Oct for Race Engine Challenge competition
11.95 compression, runs on pump gas. Stock 360 Magnum block, cast tunnel ram.
Victor heads he did with 2.175 intake valves.
Guess it will be live streamed, that will be fun to watch.
Mopar Muscle feature on build upcoming.

Last edited by B3422W5; 09/25/18 02:37 PM.

69 Dart GTS, performance upgrades in progress
11.26@ 118.40 best so far. Stock 360 shortblock with eddie heads.
3285 race weight
Re: 771 horse stock stroke 360 motor, pump gas [Re: B3422W5] #2554577
09/25/18 03:57 PM
09/25/18 03:57 PM
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So. Burlington, Vt.
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Impressive!!

I don’t remember how the scoring will be done compared to the EM contests.


68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
Re: 771 horse stock stroke 360 motor, pump gas [Re: B3422W5] #2554627
09/25/18 05:14 PM
09/25/18 05:14 PM
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Fulton County, PA
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Having dealt with 360s in the past, I'll just say, ummmmm...OK. Power adder?


If the results don't match the theory, change the theory.
Re: 771 horse stock stroke 360 motor, pump gas [Re: B3422W5] #2554634
09/25/18 05:23 PM
09/25/18 05:23 PM
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So. Burlington, Vt.
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Looks like the gist of the scoring is best average hp over three runs, 4000-7500rpm, times 1000, divided by cubic inch.


68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
Re: 771 horse stock stroke 360 motor, pump gas [Re: CMcAllister] #2554645
09/25/18 05:34 PM
09/25/18 05:34 PM
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Portage,michigan
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Originally Posted By CMcAllister
Having dealt with 360s in the past, I'll just say, ummmmm...OK. Power adder?


No power adder.
Motor will be at the competition week from Thursday, we will get to see it run.
Block is 100 over, 3/4 filled. He was surprised how much meat remained when he sonic checked it.
Made this number at 7500 rpm. 775 lift roller. Has around 55 pulls on it sorting it out

Jack Barna..... Valley performance and Machine

Last edited by B3422W5; 09/25/18 05:40 PM.

69 Dart GTS, performance upgrades in progress
11.26@ 118.40 best so far. Stock 360 shortblock with eddie heads.
3285 race weight
Re: 771 horse stock stroke 360 motor, pump gas [Re: B3422W5] #2554679
09/25/18 06:21 PM
09/25/18 06:21 PM
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Oregon
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That is a lot of steam for a stock stroke 360, even with the big bore size. It took me a few years to make 750+ hp with my pump gas 470 engine and some people didn't believe those numbers.

Of course, the NASCAR boys make even more power with fewer inches so it just all depends on how good the heads are.

Re: 771 horse stock stroke 360 motor, pump gas [Re: AndyF] #2554685
09/25/18 06:34 PM
09/25/18 06:34 PM
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Portage,michigan
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Originally Posted By AndyF
That is a lot of steam for a stock stroke 360, even with the big bore size. It took me a few years to make 750+ hp with my pump gas 470 engine and some people didn't believe those numbers.

Of course, the NASCAR boys make even more power with fewer inches so it just all depends on how good the heads are.


Nice thing is we will all get to see it at a neutral setting competition. Hope he kicks some butt


69 Dart GTS, performance upgrades in progress
11.26@ 118.40 best so far. Stock 360 shortblock with eddie heads.
3285 race weight
Re: 771 horse stock stroke 360 motor, pump gas [Re: B3422W5] #2554688
09/25/18 06:36 PM
09/25/18 06:36 PM
Joined: Jan 2003
Posts: 12,358
So. Burlington, Vt.
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2.03 hp/ci....... pretty stout.


68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
Re: 771 horse stock stroke 360 motor, pump gas [Re: B3422W5] #2554690
09/25/18 06:41 PM
09/25/18 06:41 PM
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Canada
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I know there's formulas for this but is 770 hp possible at 7500 rpm with only 378"? I know that much hp is doable at the cu in for sure, I just thought it would be at a higher rpm, have to be some pretty stout volumetric efficiency.

Re: 771 horse stock stroke 360 motor, pump gas [Re: fast68plymouth] #2554691
09/25/18 06:41 PM
09/25/18 06:41 PM
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NW Indiana
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fbs63 Offline
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I would love to see an engine masters where they dyno test then put the engine in a car. The power numbers are always impressive but I cant remember hearing of a quick car with one of these engines.

Re: 771 horse stock stroke 360 motor, pump gas [Re: B3422W5] #2554692
09/25/18 06:43 PM
09/25/18 06:43 PM
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Portage,michigan
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Picture of the engine under “ view blog” on Valley performance and machines website.
Purdy


69 Dart GTS, performance upgrades in progress
11.26@ 118.40 best so far. Stock 360 shortblock with eddie heads.
3285 race weight
Re: 771 horse stock stroke 360 motor, pump gas [Re: fbs63] #2554697
09/25/18 06:54 PM
09/25/18 06:54 PM
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Portage,michigan
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Originally Posted By fbs63
I would love to see an engine masters where they dyno test then put the engine in a car. The power numbers are always impressive but I cant remember hearing of a quick car with one of these engines.


I bought an enginemasters 318 motor off one off the competitors from a few years back( in fact one of his partners, Randy Malik i see is in this competition) installed it in my car, and it ran nearly exactly what i figured it would run based on its pulls at enginemasters.

You can google the build/ engine......... LA Confidential Mopar....... will pull it up.
Beat on it Track and street for three years till selling the car.
Mid 11’s at 3400 pounds with flat hood.

Another member on here bought a motor Brett Miller built for enginemasters, it too puts down the number at the track it should. He has a small pickup, is from down South posts on here often, his screen name eludes me, but he’s on here all the time

So there are two real world examples


69 Dart GTS, performance upgrades in progress
11.26@ 118.40 best so far. Stock 360 shortblock with eddie heads.
3285 race weight
Re: 771 horse stock stroke 360 motor, pump gas [Re: WO23Coronet] #2554705
09/25/18 07:09 PM
09/25/18 07:09 PM
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So. Burlington, Vt.
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Originally Posted By WO23Coronet
I know there's formulas for this but is 770 hp possible at 7500 rpm with only 378"? I know that much hp is doable at the cu in for sure, I just thought it would be at a higher rpm, have to be some pretty stout volumetric efficiency.


Before the rules changes that killed the 358” Cup motors by about 200hp, when they were solidly well over 900hp....... I’m sure they were also solidly over 770hp@7500 rpm.


68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
Re: 771 horse stock stroke 360 motor, pump gas [Re: B3422W5] #2554710
09/25/18 07:39 PM
09/25/18 07:39 PM
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Park Forest, IL
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That's one bad little small block. boogie


"Everybody funny, now you funny too."
Re: 771 horse stock stroke 360 motor, pump gas [Re: B3422W5] #2554730
09/25/18 08:16 PM
09/25/18 08:16 PM
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New York
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At that lift, the rocker arm is pointing nearly up & down every rotation (this is a function of lever length vs. lift, nothing to do with ratio).
Life expectancy...?


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Re: 771 horse stock stroke 360 motor, pump gas [Re: polyspheric] #2554739
09/25/18 08:32 PM
09/25/18 08:32 PM
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Portage,michigan
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Originally Posted By polyspheric
At that lift, the rocker arm is pointing nearly up & down every rotation (this is a function of lever length vs. lift, nothing to do with ratio).
Life expectancy...?


Very good point. I mentioned to Jack that when you turn the motor over to check lash it looks like your falling off a cliff at that lift on 59 degree deal. Like he said, lift is more like 740 after deflection.
For reference, i ran a 700 roller 7500 pm for years( and often) and never had issue with anything. Ultra bulletproof stuff( Jesel, etc, etc) but valvetrain was never broken.... never spit a pushrod, adj backed off, lash issue. Quiet as a church mouse

Last edited by B3422W5; 09/25/18 08:35 PM.

69 Dart GTS, performance upgrades in progress
11.26@ 118.40 best so far. Stock 360 shortblock with eddie heads.
3285 race weight
Re: 771 horse stock stroke 360 motor, pump gas [Re: B3422W5] #2554746
09/25/18 08:45 PM
09/25/18 08:45 PM
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Melbourne , Australia
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To save people a google search

http://www.valleyperformancellc.com/blog/


Alan Jones
Re: 771 horse stock stroke 360 motor, pump gas [Re: B3422W5] #2554845
09/25/18 11:34 PM
09/25/18 11:34 PM
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Oakland, MI
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1.43 ft/lb per CID at peak hp RPM on pump gas?

That is one mad mother of it really did that.

Re: 771 horse stock stroke 360 motor, pump gas [Re: B3422W5] #2554856
09/25/18 11:54 PM
09/25/18 11:54 PM
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Kalispell Mt.
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I though the victors moved the shaft away from the valve so you needed a longer rocker on the valve side? Also a longer valve that further compunds the 59* lifter problem and add on top of that the offset? Pretty impressive it dont just cough the PR out under the intake when you crank it over...


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Re: 771 horse stock stroke 360 motor, pump gas [Re: HotRodDave] #2554857
09/25/18 11:57 PM
09/25/18 11:57 PM
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Portage,michigan
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Originally Posted By HotRodDave
I though the victors moved the shaft away from the valve so you needed a longer rocker on the valve side? Also a longer valve that further compunds the 59* lifter problem and add on top of that the offset? Pretty impressive it dont just cough the PR out under the intake when you crank it over...


Motor has over 50 pulls on it, spread out over at least 3 sessions, with another upcoming


69 Dart GTS, performance upgrades in progress
11.26@ 118.40 best so far. Stock 360 shortblock with eddie heads.
3285 race weight
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